Primary Tumor (T)

TX: Primary tumor cannot be assessed

T0: No evidence of primary tumor

Tis: "insitu" – cancer contained

T1: Tumor 2 cm or less in size

T2: Tumor > 2 cm but < 4 cm in size

T3: Tumor > 4 cm in size

T4a: Tumor invades structures next to it

T4b: Tumor invades to areas beyond the structures next to it

Regional Lymph Nodes (N)

NX: Regional nodes cannot be assessed or unknown

N0: No regional lymph node metastasis

N1: Metastasis in 1 lymph node on the same side as the tumor, < 3 cm in size

N2: Metastases in 1 or more nodes on same, opposite, or both sides, between 3-6 cm in size

N3: Metastases in 1 or more nodes, > 6 cm in size

Distant Metastasis (M)

MX: Distant metastasis cannot be assessed

M0: No distant metastasis

M1: Distant metastasis

Staging